Abstract
<p>To support the IP 300 program rice varieties<br />with both early maturity and high productivity are needed.<br />The objective of the research was to improve those traits in<br />Code variety using RIL (recombinant inbreed line) methods.<br />The research was conducted in the year 2009-2011 at the<br />greenhouse and laboratory of Molecular Biology, Indonesian<br />Center for Agricultural Biotechnology and Genetic<br />Resources Research and Development. Materials consisted<br />of 600 individuals of F2 derived from one of F1 Code x<br />Nipponbare crossed plants and they were planted up to F4<br />with seed-to-seed, then confirmed by 8 microsatelite<br />markers linked to loci of Hd genes. The molecular analysis<br />showed that 84 of 600 F2 plants produced. The F4 plants have<br />50% of flowering time shorter than F2 and F3 plants. Two<br />lines (CdNb_388 and CdNb_270) have higher productivity<br />compared to Code by the number of productive tillers (20)<br />and the number of tiller grains (2240 and 1740) and have<br />closely 50% of 60 days flowering time of Nipponbare. Three<br />lines of F4 plants (CdNb_270, 364, and 388) were predicted<br />to have allele of Hd7 gene, and CdNb_472 was predicted to<br />have alelle of Hd14 gene.</p>
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